Vegetables and fruits can make your outlook more positive. Scientists at the Harvard School of Public Health published a study which concludes that people who use a lot of fresh vegetables, greens and fruits are more optimistic about their future.

The research embraced about 1,000 people of various age and both sexes. It emerged that the most positive participants had more carotenoids in their blood by 13% (carotenoids are plant pigments contained in vegetables, greens and citrus fruits). People who eat at least 3 portions of fresh fruit daily feel more high-spirited than people who don’t include them in their diet.

Earlier studies showed that carotenoids produce a positive effect on the health owing to their antioxidant properties; they can also relieve stress.